A process for the production of 2-substituted 6-alkoxycarbonyl-8-ethyl-5-oxo-5,8-dihydro-pyrido(2,3-d)-pyrimidines and of corresponding free acids
申请人:Unibios S.p.A.
公开号:EP0031120A1
公开(公告)日:1981-07-01
The invention relates to a process for the preparation of 2-substituted 6-alkoxycarbonyl-8-ethyl- 5-oxo-5, 8-dihydro-pyrido-[2, 3,-d]-pyrimidines and corresponding free acids, having the following general formula:
wherein R, = H, CH3, C2H5, and
R2 = Cl, CH30, C2H5O, CH3S, CH3SO2
which are useful intermediates for the preparation of bacteriostatic agents, such as pyromidic and pipemidic acid. The process, in the essential part, is characterized by an oxidation of the corresponding tetrahydroderivative.
本发明涉及一种制备 2-取代的 6-烷氧羰基-8-乙基-5-氧代-5, 8-二氢吡啶并-[2, 3, -d]-嘧啶和相应的游离酸的工艺,其通式如下:
其中 R, = H, CH3, C2H5, 和
R2 = Cl、CH30、C2H5O、CH3S、CH3SO2
这些物质是制备抑菌剂(如吡咯咪啶酸和哌咪啶酸)的有用中间体。该过程的基本特征是相应的四氢衍生物被氧化。